How to talk to a girl at parties?
Don't try to be who you are not, and don't pretend to be a tough guy.
The best weapon is a sense of humor.
Be in the center of the fun, tell funny stories and the girls will notice you.
As soon as you see that the girl is looking into your eyes, go for it!
It is enough to ask her name and shake her hand.
Your fear will go away instantly, and the conversation will start by itself.